Electrophotography – Image formation – Development
Patent
1998-06-22
1999-12-28
Moses, Richard
Electrophotography
Image formation
Development
399252, G03G 1508
Patent
active
060092955
ABSTRACT:
Impurities contained in a developer are captured and prevented from mixing into the developer again, thereby to avoid lowering of image quality due to the impurities. Such impurities include aggregates of the developer formed in a developing apparatus, insufficiently charged toner particles, defectively charged toner particles having an opposite polarity to a predetermined polarity, and defective carrier particles lacking in strength for being held by a developing magnet roller. A recess is provided between peaks of magnetism located in a lower portion of a developing magnet roller. The recess has an air pressure substantially equal to an air pressure (atmospheric pressure) in the developing apparatus, so that air in the developing apparatus and the recess does not flow only in one direction. Impurities contained in the developer circulating around the developing roller cannot be magnetically held in the lower half of the developing roller because of centrifugal force and gravity. Consequently, the impurities are separated and collected in the recess.
REFERENCES:
patent: 5250749 (1993-10-01), Aimoto
patent: 5752138 (1998-05-01), Wing et al.
patent: 5790920 (1998-08-01), Teramura et al.
Hiroyasu Takao
Ishiguro Yasuyuki
Kimura Takahiko
Mizoguchi Fumito
Sanada Yoshiaki
Moses Richard
Ngo Hoang
Sharp Kabushiki Kaisha
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